Bookshelf speaker series jbl arena system 2 way system principle passive frequency response 55 40000 hz sensitivity 87 dbmw impedance 8 ohm crossover frequency 2000 hz recommended amplifier power 20 125 power supply passive colour black front colour black speaker enclosures magnetically shielded bass reflex number of tweeters 1 treble chassis 25 mm tweeter material tweeter tissue number of subwoofers 1 bass chassis 178 mm subwoofer ma